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Manipulating surface-plasmon-polariton launching with quasi-cylindrical waves
Chengwei Sun1, Jianjun Chen1, Wenjie Yao2
11] State Key Laboratory for Mesoscopic Physics and Department of Physics, Peking University, Beijing 100871, China [2] Collaborative Innovation Center of Quantum Matter, Beijing, China.
Scientific Reports
|June 11, 2015
Summary
Researchers developed an ultra-broadband unidirectional surface plasmon polariton (SPP) launcher using quasi-cylindrical waves in an asymmetric slit. This innovation significantly broadens the operational bandwidth for plasmonic circuits.
Area of Science:
- Photonics and Plasmonics
- Nanotechnology
- Optoelectronics
Background:
- Launching free-space light into surface plasmon polaritons (SPPs) with broad bandwidth is crucial for plasmonic circuits.
- Current methods based on pure SPP interference have limitations in broadening bandwidths for unidirectional SPP launching.
Purpose of the Study:
- To experimentally realize an ultra-broadband unidirectional SPP launcher.
- To investigate the manipulation of SPP intensities using quasi-cylindrical waves (Quasi-CWs).
- To extend this principle to three-dimensional subwavelength plasmonic waveguides.
Main Methods:
- Utilizing a submicron asymmetric slit to excite and manipulate SPPs.
- Employing quasi-cylindrical waves (Quasi-CWs) to control SPP intensities.
- Experimental realization and characterization of the SPP launching mechanism.
Main Results:
- An ultra-broadband unidirectional SPP launcher was achieved in an asymmetric slit.
- Quasi-CWs in the nano-groove scatter into SPPs, enabling additional interference and manipulated launching.
- The principle was successfully extended to 3D subwavelength plasmonic waveguides, showing unidirectional SPP propagation.
Conclusions:
- The proposed method using Quasi-CWs in asymmetric structures enables ultra-broadband unidirectional SPP launching.
- This approach offers a significant advancement for integrated plasmonic devices and circuits.
- The demonstrated bandwidth of approximately 700 nm (600-1300 nm) highlights the potential for high-performance plasmonic applications.
